Part A
AD5254BRUZ50
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2128 PCS
- Package
- TSSOP-20
- Series
- Acquisição de dados - Potenciômetros Digitais
Replacement verdict
Not a drop-in replacement
The AD5254BRUZ50 and AD5251BRU50-RL7 are not functionally interchangeable. They differ in channel count, interface protocol, and nonvolatile memory architecture, requiring circuit redesign and firmware modification for any substitution attempt.
Different channel count
Different interface protocol
Different memory architecture
Different package pinout
Parts at a glance
Part B
AD5251BRU50-RL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7894 PCS
- Package
- TSSOP-14
- Series
- Acquisição de dados - Potenciômetros Digitais
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD5254BRUZ50 | AD5251BRU50-RL7 | Why it matters |
|---|---|---|---|
| Number of Positions | 256 | 64 | Determines the resolution of resistance adjustment; a 256-position device offers finer wiper granularity than a 64-position device. |
| Number of Channels | 4 | 2 | Indicates how many independent potentiometer channels are integrated; affects board space and circuit complexity for multi-channel designs. |
| End-to-End Resistance | 50 kΩ | 50 kΩ | Sets the nominal resistance range of the potentiometer, directly impacting the achievable voltage division and current levels. |
| Interface Type | I²C | Up/Down (3-wire) | Defines the digital communication protocol required by the host controller; incompatible interfaces prevent direct drop-in replacement. |
| Nonvolatile Memory | Yes (EEPROM) | No | Nonvolatile storage retains the wiper setting after power loss, which is critical for applications requiring a known startup state. |
| Package / Mounting | 14-TSSOP | 14-TSSOP | Package type and pin count affect PCB footprint and assembly compatibility; matching packages simplify substitution. |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | Determines compatibility with the system power rail; both parts support common 3 V and 5 V logic supplies. |
| Wiper Resistance | ~200 Ω | ~200 Ω | Adds a fixed series resistance in the signal path; lower wiper resistance improves accuracy in low-impedance applications. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental conditions under which the device is guaranteed to operate within specification. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD5254BRUZ50 | AD5251BRU50-RL7 |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Active | Obsolete |
| Taper | Linear | Linear |
| Configuration | Potentiometer | Potentiometer |
| Number of Circuits | 4 | 2 |
| Number of Taps | 256 | 64 |
| Resistance(Ohms) | 50k | 50k |
| Interface | I²C | I²C |
| Memory Type | Non-Volatile | Non-Volatile |
| Voltage - Supply | 2.7V ~ 5.5V, ±2.25V ~ 2.75V | 2.7V ~ 5.5V, ±2.25V ~ 2.75V |
| Features | Selectable Address | Selectable Address |
| Tolerance | ±20% | ±20% |
| Temperature Coefficient(Typ) | 650ppm/°C | 650ppm/°C |
| Mounting Type | Surface Mount | Surface Mount |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What are the key differences between the AD5254BRUZ50 and AD5251BRU50-RL7?
The AD5254BRUZ50 is a quad-channel, 256-position digital potentiometer with an I2C interface and 50 kΩ end-to-end resistance, housed in a 20-lead TSSOP package. The AD5251BRU50-RL7 is a dual-channel, 64-position digital potentiometer with an up/down interface and 50 kΩ end-to-end resistance, supplied in a 14-lead TSSOP package on a 7-inch reel. Key differences include channel count (4 vs 2), resolution (256 vs 64 positions), control interface (I2C vs up/down), and package pin count.
Are the AD5254BRUZ50 and AD5251BRU50-RL7 pin-to-pin compatible?
No. The AD5254BRUZ50 uses a 20-lead TSSOP package, while the AD5251BRU50-RL7 uses a 14-lead TSSOP package. The different pin counts and pin functions prevent direct pin-to-pin substitution without PCB redesign.
Can the AD5251BRU50-RL7 be used as a drop-in replacement for the AD5254BRUZ50?
No. The AD5251BRU50-RL7 has only two channels and 64 positions, whereas the AD5254BRUZ50 provides four channels and 256 positions. The control interfaces also differ (up/down vs I2C). A drop-in replacement is not possible without significant design changes.
What are the end-to-end resistance values for both parts?
Both the AD5254BRUZ50 and AD5251BRU50-RL7 have a nominal end-to-end resistance of 50 kΩ, as indicated by the "50" suffix in their part numbers.
What control interfaces do the AD5254BRUZ50 and AD5251BRU50-RL7 use?
The AD5254BRUZ50 uses a 2-wire I2C-compatible serial interface. The AD5251BRU50-RL7 uses a 3-wire up/down (increment/decrement) interface with a chip select input.
What are the operating temperature ranges for these digital potentiometers?
Both the AD5254BRUZ50 and AD5251BRU50-RL7 are specified for the industrial temperature range of −40°C to +85°C, as denoted by the "B" grade in their part numbers.
How many wiper positions are available in each device?
The AD5254BRUZ50 provides 256 wiper positions (8-bit resolution). The AD5251BRU50-RL7 provides 64 wiper positions (6-bit resolution).
What package types are used for the AD5254BRUZ50 and AD5251BRU50-RL7?
The AD5254BRUZ50 is supplied in a 20-lead TSSOP package. The AD5251BRU50-RL7 is supplied in a 14-lead TSSOP package and is delivered on a 7-inch reel (RL7 suffix).